<template>
    <div style="width:100%;height:100%;overflow:hidden">
        <div id="map"></div>
         <pre id="coordinates" class="coordinates" ref="coordinates"></pre>
    </div>
</template>
<script>
import mapboxgl from 'mapbox-gl'
export default {
    data () {
        return {
         map:null,
         canvas:null,
         geojson:null
        }
    },
    mounted(){
      this.init()
    },
    methods: {
        init(){
            	this.mapbgl.accessToken = 'pk.eyJ1IjoiMTgzODI0ZHl0IiwiYSI6ImNqbHExNDVjZzI0ZmUza2wxMDhocnlyem4ifQ.FZoJzmqTtli8hAvvAc1OPA';
                this.map = new this.mapbgl.Map({
                    container: 'map',
                    style: 'mapbox://styles/mapbox/light-v10',
                    center: [-77.035, 38.875],
                    zoom: 12
                });
               var geojson = {
                    'type': 'FeatureCollection',
                    'features': [
                    {
                    'type': 'Feature',
                    'properties': {},
                    'geometry': {
                    'coordinates': [
                    [-77.044211, 38.852924],
                    [-77.045659, 38.860158],
                    [-77.044232, 38.862326],
                    [-77.040879, 38.865454],
                    [-77.039936, 38.867698],
                    [-77.040338, 38.86943],
                    [-77.04264, 38.872528],
                    [-77.03696, 38.878424],
                    [-77.032309, 38.87937],
                    [-77.030056, 38.880945],
                    [-77.027645, 38.881779],
                    [-77.026946, 38.882645],
                    [-77.026942, 38.885502],
                    [-77.028054, 38.887449],
                    [-77.02806, 38.892088],
                    [-77.03364, 38.892108],
                    [-77.033643, 38.899926]
                    ],
                    'type': 'LineString'
                    }
                    }
                    ]
                    };
            this.map.on('load',()=>{
                this.map.addSource('line', {
                    type: 'geojson',
                    lineMetrics: true,
                    data: geojson
                    });
                this.map.addLayer({
                    type: 'line',
                    source: 'line',
                    id: 'line',
                    paint: {
                    'line-color': 'red',
                    'line-width': 14,
                    // 'line-gradient' must be specified using an expression
                    // with the special 'line-progress' property
                    'line-gradient': [
                    'interpolate',
                    ['linear'],
                    ['line-progress'],
                    0,
                    'blue',
                    0.1,
                    'royalblue',
                    0.3,
                    'cyan',
                    0.5,
                    'lime',
                    0.7,
                    'yellow',
                    1,
                    'red'
                    ]
                    },
                    layout: {
                    'line-cap': 'round',
                    'line-join': 'round'
                    }
                    });
            })
      }
    }
}
</script>
<style scoped>
@import url('https://api.tiles.mapbox.com/mapbox-gl-js/v0.44.2/mapbox-gl.css');
#map{
    width:100%;
    height:100%
}
.coordinates {
    background: rgba(0, 0, 0, 0.5);
    color: #fff;
    position: absolute;
    bottom: 40px;
    left: 10px;
    padding: 5px 10px;
    margin: 0;
    font-size: 11px;
    line-height: 18px;
    border-radius: 3px;
    display: none;
}
</style>